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Site Background Information: Den's Auto Repair 0 <br /> Page 8 of 8 51 <br /> • TPH-g was detected in grab ground water samples collected from HU2 and . The G� <br /> highest concentrations of TPH-g were detected at the base of HU2 at approximately. 0 feet <br /> bsg. The lateral distribution of TPH-g suggests the possibility of additional sour e(s) of <br /> contamination. p),,to 1 <br /> • BTEX compounds except ethylbenzene were detected in grab ground water samples from <br /> HU2 and HU3. Benzene was the most prevalent of the BTEX compounds, and is present at <br /> concentrations exceeding the CDPH Maximum Contaminant Level (MCL) for drinking <br /> water; in addition,the concentrations of benzene appear.to increase with depth both on-site <br /> at CPT1 and off.-site at CPT3 and CPT4. The lateral distribution of benzene suggests the <br /> oSsflity"dditio�ial.source(s)of contamma I <br /> • The migration of TPH-g and BTEX from the UST source has been limited and thus on-site <br /> remediation should initiated to prevent the off-site migration of the dissolved hydrocarbons. <br /> Treatment of off-site dissolved hydrocarbons is not readily feasible;however the volume of <br /> hydrocarbons should generally benefit and reduce in concentration/mass based on a <br /> successful on-site ground water remediation. �. <br /> i <br /> I <br /> Advanced GeoEnvironmental,Inc. <br />